Mercedes-Benz conducted a new test of electric car technology. A special EQS model equipped with a solid-state battery traveled 1,205 kilometers on a single charge. This test drive, conducted at the end of August, began in Stuttgart and concluded in Malmö, Sweden.

Mercedes-Benz EQS puts on a solid-state battery show

This journey demonstrated the reliable operation of solid-state battery technology not only in laboratory settings but also under real-world road conditions. At the end of the 1,205-kilometer journey, the vehicle still had 137 kilometers of range. This brings the vehicle’s total range to 1,432 kilometers.

This test also surpassed Mercedes’ previous record. The Vision EQXX, which covered a distance of 1,202 kilometers from Stuttgart to Silverstone, was covered by the new EQS by 3 kilometers. Mercedes-Benz planned this journey as part of a test program announced in February.

The EQS reached Sweden using German and Danish highways. The vehicle’s electric navigation system determined the route by taking into account factors such as road gradients, traffic, temperature, heating, and cooling. The company continues to test the performance of the new battery technology in different climates and on long routes.

The battery system in question was developed in partnership with Mercedes-AMG High Performance Powertrains (HPP) and US cell manufacturer Factorial Energy. The cells used in the battery are based on a technology called FEST (Factorial Electrolyte System Technology).

This new system uses pneumatic actuators to compensate for volume changes that occur during charging and discharging. This keeps the cells under constant pressure, ensuring consistent performance.

This system increases battery capacity by 25% while remaining similar in weight and size to a standard EQS battery. Passive airflow cooling also contributes to energy efficiency.